Replica

Definitions

1. A copy of a database, service instance, or data partition that mirrors the primary's state, providing read scalability, fault tolerance, or geographic locality. Replicas may be synchronous (consistent but slower) or asynchronous (faster but potentially stale).

   In plain English: A copy of your data or service running on another server, so if one goes down the others can keep things working.

   Example: "We added two read replicas in eu-west to reduce latency for European users — writes still go to the primary in us-east."

Related Terms

• index
• foreign key
• ACID
• Partition
• Scalar
• Search Index
• Shared Nothing Architecture
• Split Brain
• UUID
• CockroachDB
• Edge Security
• Context Propagation